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CVE-2026-11352

QUIC zero-length UDP datagrams busy-loop

High7.5EPSS 1.0%
Published
Updated
Reserved
Assigned by
curl

Description

An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client.

Scores

CVSS scores of CVE-2026-11352, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.0% · top 37% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • curl · curl

    • affected 8.18.0 – < 8.20.1

  • curl · curl

    • affected 6a3d0b6d631d5e9bec797306b5b41a9f440a088d – < 56eca2afb4806f1032872fa97d1834b3c1385276

  • curl · curl

    • affected 8.20.0
    • affected 8.19.0
    • affected 8.18.0

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .